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Kapteyn's Star was considered to be a rather run-of-the-mill red dwarf star. Then astronomers discovered it was fucking old, 11.5 billion years old or a mere 2 billion years younger than the entire universe. Its high proper motion, the fact it is moving retrograde, and its range of elemental abundances lead astronomers to conclude that it was originally part of Omega Centauri, the old dwarf galaxy that the Milky Way consumed.
Kapteyn's Star is currently 13 light-years away from Terra. But it was only 7 light years away a mere 10,800 year ago, about the time our Mesolithic ancestors were busy inventing agriculture. In 2014 astronomers observed convincing evidence of two low mass planets, Kapteyn b and Kapteyn c. Kapteyn b is currently the oldest known potentially habitable planet.